/* * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.jmx.snmp; /** * Represents an SNMP null value. *
This API is a Sun Microsystems internal API and is subject * to change without notice.
*/ public class SnmpNull extends SnmpValue { private static final long serialVersionUID = 1783782515994279177L; // CONSTRUCTORS //------------- /** * Constructs a newSnmpNull
.
*/
public SnmpNull() {
tag = NullTag ;
}
/**
* Constructs a new SnmpNull
.
* SnmpNull
from the specified tag value.
* @param t The initialization value.
*/
public SnmpNull(int t) {
tag = t ;
}
// PUBLIC METHODS
//---------------
/**
* Returns the tag value of this SnmpNull
.
* @return The value.
*/
public int getTag() {
return tag ;
}
/**
* Converts the NULL
value to its ASN.1 String
form.
* When the tag is not the universal one, it is preprended
* to the String
form.
* @return The String
representation of the value.
*/
public String toString() {
String result = "" ;
if (tag != 5) {
result += "[" + tag + "] " ;
}
result += "NULL" ;
switch(tag) {
case errNoSuchObjectTag :
result += " (noSuchObject)" ;
break ;
case errNoSuchInstanceTag :
result += " (noSuchInstance)" ;
break ;
case errEndOfMibViewTag :
result += " (endOfMibView)" ;
break ;
}
return result ;
}
/**
* Converts the NULL
value to its SnmpOid
form.
* Normally, a NULL
value cannot be used as an index value,
* this method triggers an exception.
* @return The OID representation of the value.
*/
public SnmpOid toOid() {
throw new IllegalArgumentException() ;
}
/**
* Performs a clone action. This provides a workaround for the
* SnmpValue
interface.
* @return The SnmpValue clone.
*/
final synchronized public SnmpValue duplicate() {
return (SnmpValue) clone() ;
}
/**
* Clones the SnmpNull
object, making a copy of its data.
* @return The object clone.
*/
final synchronized public Object clone() {
SnmpNull newclone = null ;
try {
newclone = (SnmpNull) super.clone() ;
newclone.tag = tag ;
} catch (CloneNotSupportedException e) {
throw new InternalError() ; // vm bug.
}
return newclone ;
}
/**
* Returns a textual description of the type object.
* @return ASN.1 textual description.
*/
final public String getTypeName() {
return name ;
}
/**
* Checks if this SnmpNull
object corresponds to a noSuchObject
value.
* @return true
if the tag equals {@link com.sun.jmx.snmp.SnmpDataTypeEnums#errNoSuchObjectTag},
* false
otherwise.
*/
public boolean isNoSuchObjectValue() {
return (tag == SnmpDataTypeEnums.errNoSuchObjectTag);
}
/**
* Checks if this SnmpNull
object corresponds to a noSuchInstance
value.
* @return true
if the tag equals {@link com.sun.jmx.snmp.SnmpDataTypeEnums#errNoSuchInstanceTag},
* false
otherwise.
*/
public boolean isNoSuchInstanceValue() {
return (tag == SnmpDataTypeEnums.errNoSuchInstanceTag);
}
/**
* Checks if this SnmpNull
object corresponds to an endOfMibView
value.
* @return true
if the tag equals {@link com.sun.jmx.snmp.SnmpDataTypeEnums#errEndOfMibViewTag},
* false
otherwise.
*/
public boolean isEndOfMibViewValue() {
return (tag == SnmpDataTypeEnums.errEndOfMibViewTag);
}
// VARIABLES
//----------
/**
* Name of the type.
*/
final static String name = "Null" ;
/**
* This is the tag of the NULL value. By default, it is the universal tag value.
*/
private int tag = 5 ;
}